Metal-Fab knows the importance of selecting quality pieces for your B vent pipe. These rigid, double-walled designs incorporate an insulating air space and are use with Category 1 appliances including gas-fired furnaces, boilers, water heater, and fireplaces. Just keep in mind that this type of pipe is never suitable for use with wood-burning or coal-burning appliances. All the various parts of Metal-Fab systems feature a SureLock connection that don't need tools to assemble. Find the right diameter and length for your Metal-Fab flue pipe needs today!